I have recently danced with a couple of partners who seem to like to use a very prominent sway/lean in ECS. It does help you move more, but I find it uncomfortable to bend that much, and I think it looks funny.

Besides, I've been taught that a big side-to-side movement is not necessarily desirable in ECS; keep the knees soft, move the center, and let the side to side be whatever it is. Other opinions?